I have already lost 3 chickens to resp. problems: coughing, sneezing, infected eyes, etc. I have given them everything I can think of. I've tried terramycin eye ointment, duramycin and sulmet in their water and tylan injections. This worked for most of the sick ones, but I have lost three so far. So, I thought I would try to worm them for gape worms (just incase). Does anyone know what kind of medication to use for this? Please help soon!